1. Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia 30322.
2. HIV Immunology and Diagnostics Branch, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.
3. Department of Epidemiology, Rollins School of Public Health of Emory University, Atlanta, Georgia 30322.
4. Division of HIV/AIDS Prevention, Surveillance and Epidemiology, National Center for HIV/STD/TB Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.
5. Department of Gynecology/Obstetrics, Emory University School of Medicine, Atlanta, Georgia 30322.